
#include "cm_uart.h"
#include "MessageDispaterPort.h"
#include "cm_common.h"

#include "stdio.h"
#include "stdint.h"
#include "unistd.h"
#include "sys/wait.h"
#include "sys/types.h"
#include "sys/stat.h"
#include "fcntl.h"
#include "errno.h"
#include "stdlib.h"
#include "termios.h"
static char *dev = "/dev/ttyS0";

static int uart_fd;
/* Table of CRC values for high-order byte */
static const uint8_t table_crc_hi[] = {
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1,
    0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1,
    0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40};

/* Table of CRC values for low-order byte */
static const uint8_t table_crc_lo[] = {
    0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5,
    0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B,
    0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE,
    0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6,
    0xD2, 0x12, 0x13, 0xD3, 0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3,
    0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,
    0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8,
    0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C,
    0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26, 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21,
    0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67,
    0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A,
    0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,
    0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5, 0x77, 0xB7,
    0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0, 0x50, 0x90, 0x91, 0x51,
    0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
    0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98,
    0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D,
    0x4C, 0x8C, 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,
    0x41, 0x81, 0x80, 0x40};
static int enable_uart_recv()
{
    int ret = system("echo 0 > /sys/class/gpio/gpio53/value");
    if (ret == -1)
    {
        perror("system call failed");
        return -1;
    }
    else if (WIFEXITED(ret) && WEXITSTATUS(ret) == 0)
    {
        return 0; // Success
    }
    else
    {
        fprintf(stderr, "Command failed with exit status %d\n", WEXITSTATUS(ret));
        return -1;
    }
}

static int enable_uart_send()
{
    int ret = system("echo 1 > /sys/class/gpio/gpio53/value");
    if (ret == -1)
    {
        perror("system call failed");
        return -1;
    }
    else if (WIFEXITED(ret) && WEXITSTATUS(ret) == 0)
    {
        return 0; // Success
    }
    else
    {
        fprintf(stderr, "Command failed with exit status %d\n", WEXITSTATUS(ret));
        return -1;
    }
}

static int uart_ready()
{
    if (access("/sys/class/gpio/gpio53", F_OK) != 0)
    {
        LOGD("init serial port gpio53\n");
        char buf[1024] = {0};
        snprintf(buf, sizeof(buf), "echo 53 > /sys/class/gpio/export");
        system(buf);
        snprintf(buf, sizeof(buf), "echo out > /sys/class/gpio/gpio53/direction");
        system(buf);
    }
    return 0;
}
static int open_uart()
{


    if(uart_ready() != 0)
    {
        LOGD("uart ready failed\n");
        return -1;
    }
    if(enable_uart_recv() != 0)
    {
        LOGD("enable uart recv failed\n");
        return -1;
    }
    int ret = cm_uart_open(dev);
    if (ret > 0)
    {
        uart_fd = ret;
        ret = cm_uart_init(ret, 230400, 0, 8, 1, 'n');
        if (ret < 0)
        {
            LOGD("uart init failed\n");
            cm_uart_close(uart_fd);
        }
        else
        {
            LOGD("uart init success dev [%s]", dev);
            return 0;
        }
    }
    else
    {
        LOGD("ERROR: open uart [%s] failed ret [%d]\n", dev, ret);
    }
    return -1;
}


static int close_uart()
{
    if (uart_fd > 0)
    {
        cm_uart_close(uart_fd);
        uart_fd = -1;
    }
    return 0;
}


static int recv_uart(unsigned char *data, int len)
{
    return cm_uart_recv_simple(uart_fd, data, len);
}

static int send_uart(unsigned char *data, int len)
{
    return cm_uart_send_until(uart_fd, data, len);
}




static int recv_message(unsigned char *data, int len)
{
    if (uart_fd <= 0)
    {
        return -1;
    }
    enable_uart_recv();
    int step = 1;
    int c = 0;
    int pos = 0;
    int data_len = 0;

    while (1)
    {
        switch (step)
        {
        case 1:
        {
            cm_uart_recv_simple(uart_fd, data, 1);
            c++;
            if (data[0] == 0x01)
            {   
                printf("data[0] == 0x01\n");
                c = 0;
                step = 2;
            }
        }
        break;
        case 2:
            cm_uart_recv_simple(uart_fd, data + 1, 1);
            c++;
            if (data[1] == 0x17)
            {
                printf("data[1] == 0x17\n");
                c = 0;
                step = 3;
                pos += 2;
            }
            else if (data[1] == 0x01)
            {
                step = 2;
            }
            else
            {
                c = 0;
                step = 1;
            }
            break;
        case 3:
        {
            int r = cm_uart_recv_simple(uart_fd, data + pos, 12 - pos);
            if (r < 0)
            {
                break;
            }
            pos += r;
            if (pos >= 12)
            {
                data_len = (data[10] << 8) | (data[11]);
                data_len += 2; // crc
                LOGD("data len [%d]", data_len);
                if (data_len > 8000)
                {
                    LOGD("invalid data len [%d]", data_len);
                    pos = 0;
                    step = 1;
                }
                else
                {
                    step = 4;
                }
                break;
            }
        }
        break;
        case 4:
        {
            int r = cm_uart_recv_simple(uart_fd, data + pos, data_len - pos + 12);
            if (r < 0)
            {
                break;
            }
            pos += r;
            if (pos >= data_len + 12)
            {
                return pos;
            }
        }
        break;
        default:
            step = 1;
            break;
        }
    }
    return 0;
}

static uint16_t crc16(uint8_t *buffer, uint16_t buffer_length)
{
    uint8_t crc_hi = 0xFF; /* high CRC byte initialized */
    uint8_t crc_lo = 0xFF; /* low CRC byte initialized */
    unsigned int i;        /* will index into CRC lookup */

    /* pass through message buffer */
    while (buffer_length--)
    {
        i = crc_lo ^ *buffer++; /* calculate the CRC  */
        crc_lo = crc_hi ^ table_crc_hi[i];
        crc_hi = table_crc_lo[i];
    }

    return (crc_hi << 8 | crc_lo);
}


static int send_msg_pre(uint8_t *req, int req_length)
{
    uint16_t crc = crc16(req, req_length);

    /* According to the MODBUS specs (p. 14), the low order byte of the CRC comes
     * first in the RTU message */
    req[req_length++] = crc & 0x00FF;
    req[req_length++] = crc >> 8;

    return req_length;
}


static int send_message(unsigned char *data, int len)
{
    if (uart_fd <= 0)
    {
        return -1;
    }
    enable_uart_send();



    len = send_msg_pre((uint8_t *)data, len); // CRC校验在这个函数中完成

#if MESSAGE_DISPATCHER_DEBUG
    for (int i = 0; i < len; i++)
    {
        printf("%02x ", data[i]);
    }
    printf("\n");
#endif
    int ret = cm_uart_send_until(uart_fd, data, len);


    if (tcflush(uart_fd, TCIFLUSH) == -1)
    {
        perror("tcflush failed");
        // 进行错误处理
    }
    return ret;
}

void register_interface(MessageDispatcher_Interface *interface)
{
    interface->init = open_uart;
    interface->send_message = send_message;
    interface->receive_message = recv_message;
}